sister

Titles used to designate the members of a community of religious women, devoted to spiritual and charitable work, usually dwelling in communities, and bound by vows. In the older orders a distinction is made between choir sisters, who are obliged by rule to say the Divine Office in common, and lay sisters, who are engaged principally in caring for the temporal needs of the community. In some congregations, e.g., the Daughters of Charity of Saint Vincent de Paul, the local superioress called sister servant.